Means for feeding material to a cutting knife during withdrawal of the knife from the material



Sept. 20, 1955 o. H. PEARSON 2,718,261 MEANS FOR FEEDING MATERIAL TO A CUTTING KNIFE DURING WITHDRAWAL OF THE KNIFE FROM THE MATERIAL Filed Jan. 7, 1953 2 Sheets-Sheet 1 NM. 0 u 1 I l \N n l I I I 1 I QNQ.

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fl770P/VE/5 Sept. 20, 1955 o. H. PEARSON MEANS FOR FEEDING MATERIAL TO A CUTTING KNIFE DURING WITHDRAWAL OF THE KNIFE FROM THE MATERIAL Filed Jan. 7, 1955 2 Sheets-Sheet 2 United States Patent '0 lVIEANS FOR FEEDING MATERIAL TO A CUTTING KNIFE DURING WITHDRAWAL OF THE KNIFE FROM THE MATERIAL Oscar H. Pearson, Lake Villa, Ill.

Application January 7, 1953, Serial No. 330,149

4 Claims. (Cl. 164-42) My invention relates to shears for cutting sheet building material and, more particularly, to a special shear for cutting insulated siding.

Insulated siding is made up of insulation boards saturated on both sides with asphalt. Shears heretofore invented have not proven satisfactory for the cutting of this type of material. The primary object of my invention is the provision of novel and improved means for automatically and uniformly feeding the sheet-like siding to the cutting knife during withdrawal movements of the knife from the material.

A still further and highly important object of my invention is the provision of novel lubricating means for the cutting knife during cutting and withdrawal move ments of same-whereby gumrning, due to the asphalt, is totally eliminated and the efliciency of the cutting knife is greatly increased, while the amount of force required to operate same is greatly reduced.

A still further object of my invention is the provision of novel means adjacent the cutter blade for supporting the sheet material in a horizontal plane while facilitating the force required to impart feeding movements to said sheet material.

A still further object of my invention is the provision of an elongated relatively fixed body which may be longitudinally extended to several times its length in order that said body may be utilized as a guide in directing the sheet material into the cutter blade.

A still further object of my invention is the provision of a novel supporting member adjacent the rear end portion of the elongated body which may be swung outwardly at substantially right angles to said body and thus be engaged by the foot of the operator, or alternatively may be folded into an inoperative position in alignment with said body.

The above and still further objects of my invention will become apparent from the following detailed specification, appended claims and attached drawings.

Referring to the drawings, wherein like characters indicate like parts throughout the several views:

Fig. l is a view in side elevation of my novel structure;

Fig. 2 is a fragmentary detail corresponding to Fig. 1 but showing a different position of some of the parts, some parts being broken away;

Fig. 3 is a view in top plan of my novel structure;

Fig. 4 is a view partly in section and partly in rear elevation taken on the line 4--4 of Fig. l; and

Fig. 5 is an enlarged sectional view of the shearing knife.

Referring with greater particularity to the drawings, the numeral 1 indicates an elongated member forming a relatively fixed body. Preferably and as shown, the forward end portion of the body 1 is flattened on its sides, as indicated at 2, and is provided along its upper edge 3 with a slot 4 which provides laterally-spaced parallel shearing edges 5 and 6. A transverse mounting plate 7 is suitably anchored to the lower portion of the body 1 2 1 the sharpened edge of which is identified by the numeral portion 17 of the vertical mounting plate 13.

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adjacent its extreme forward end and projects laterally from each side thereof. L-shaped mounting brackets 8 are rigidly secured to opposite sides of the forward end of the plate 7 by means of nut-equipped bolts 9. Journaled to the upper end portions of the mounting brackets 8 for rotation in a horizontal plane slightly above the upper levels of the body 1 are rollers 10. Preferably and as shown, supplementary sheet supporting wings 11 are pivotally secured to the mounting plate 7 rearwardly of the rollers 10 by means of nut-equipped bolts 12. Wings 11 may be swung pivotally from the full line operative position of Figs. 3 and 4 to the dotted line position shown in Fig. 3.

A vertical mounting plate 13 is received within the extremc forward end of the slot 4 and is secured to the forward end of the body 1 by means of nut-equipped bolts 14. A handle 15, as shown being formed from tubular stock, is also flattened at is forward end, as indicated at 16. The extreme forward end of the handle 15 is bifurcated for reception therebetween of a rearwardly disposed Nutequipped bolt 18 permits pivoted movements of the free end 19. The bottom portion of the flattened end 16 of the handle 15 is slotted for the reception of the upper portion 20 of a generally segmental shearing knife 21,

22. Nut-equipped screws 23 securely lock the shearing knife 21 to the forward end portion of the handle 15. As shown, the lower portion of the shearing knife 21 is adapted to be snugly received between the shearing edges 5 and 6 provided by the slot 4 upon pivotal movements of the handle 15 about its axis 18, as shown in Fig. 1. As shown in Fig. 2, and particularly by the dotted line showing therein, the shearing knife 21 is elevated vertically'from the slot 4 upon upward movements of the handle 15 so as to permit passage therebetween and the body 1 of sheet material, indicated by the letter X.

Rigidly secured, by means of nut-equipped screws 24, to the vertical mounting plate 13, forwardly of the pivotal connection 18 of the handle 15 thereto, is an arm 25 which projects upwardly and rearwardly and terminates at its free end in overhanging spaced relation to the shearing knife 21 rearwardly of pivot 18. A depending lever 26 is pivotally secured to the free end of the arm 25, as indicated at 27. A link 28 has one end pivotally secured to a mounting lug 29 projecting upwardly from the handle 15 by means of a nut-equipped bolt or the like 30. As shown, the pivotal connection 30 is slightly rearwardly of the pivotal connection 18 and overlies the intermediate portion of the shearing knife 21. The rearward end of the link 28 is pivotally secured, as at 31, to the intermediate portion of the depending lever 26. As shown, the lower end portion 32 of lever 26 swings in a plane parallel to the plane of the movement of the handle 15 but in laterally-spaced relation thereto. A feeding member 33 is pivotally secured at its upper end to pivot pin 31 on the outer side of the lever 26. The lower end portion of the feeding member 33 is provided with a plurality of teeth 34 which are adapted to engage and impart forward feeding movements to the sheet X under movements of the handle 15 hereinafter described. As shown, a coil spring 35, having one end secured to the lever 26, as at 36, and the opposite end secured to the feeding member 33 rearwardly of the pivot 31, as indicated at 37, yieldingly biases feeding member 33 in a rearward direction, whereby to cause the inturned stop member 38 carried by the lower end portions of the feeding member 33 to engage the lower portion 32 of the lever 26.

In order to impart lubrication to the tapered cutting edge 22 of the shearingknife 21, I provide a tubular oil containing reservoir 39 which is provided with a depending wick-acting wiper element 40. Reservoir 39 is mounted by means of 'a pair of arms 41 and 42, the former of which has one end pivotally secured to the intermediate portion of the lever 26, as indicated at 43, and the other slidably received in a loop 44 on the upper end portion of the reservoir 39. Arm 42 has one end pivotally secured to the link 28, as indicated at 45, and the opposite end secured to the lower end portion of the reservoir 39, as indicated at 46.

From the above it should be obvious that as lowering or cutting movements are imparted to the handle 15, that the shearing knife 21 will cut a vertical slot in the sheet X of a width corresponding to the thickness of the shearing knife 21, which, of course, should be slightly greater in thickness than the mounting plate 13 so as to permit the mounting plate 13 to be received within the slot in the sheet X as the sheet X is progressively fed forward under feeding action of the toothed feeding member 33. Upon lifting movements to the handle 15, not only is the shearing knife 21 elevated above the level of the sheet X, but also pivotal forward movements are imparted to the lever 26 through the combined actions of lever 26 and link 28. As shown, particularly by Fig. 2, the lower end 32 of the lever 26 will positively engage the opposed stop members 38 carried by the lower end portions of the feeding member 33 whereby to impart positive feeding movements thereto. There being identical feeding members 33 on each side of the handle 15, uniform feeding movement is imparted to the sheet X. Obviously the teeth 34 of the feeding members 33 will tend to dig into the sheet X to some extent during these feeding movements. When lowering cutting movements are imparted to the handle 15, positive rearward pivotal movements are imparted to the lever 26. However, the teeth 34 of the feeding members 33 will stay within the depressions in the upper surface of the sheet X during feeding movements until the lower end 32 of the lever 26 is sufficiently elevated with respect to the sheet X to cause the feeder members 33 to return to the position as illustrated in.

Fig. 1 about the pivot axis 31 under bias of the coil spring 35. In this manner, unnecessary gouging of the upper surface of the sheet X is prevented during upward and rearward pivotal movements of the lever 26 and feeder members 33.

It should likewise be obvious that as swinging movements are imparted to the handle 15 that the wick-acting wiper elements 40, one on each side of the shearing knife 21, should make engagement with the entire arcuate cutting surface 22 thereof.

As an aid to securely retain my novel structure upon the floor during cutting movements, 1 provide a bar 47 which is pivotally secured to the rear end portion of the body 1, as indicated at 48, for movements to and away from the full line position of Fig. 3 (wherein it may be stepped upon by the operator) to the dotted line position thereof.

Also, to facilitate cutting with my novel structure, on a straight line, I provide telescoping members 49 and '50 which may be extended to the desired length.

While I have shown a commercial embodiment of my invention, it should be obvious that same is capable of modification without departure from the scope of the invention as defined in the appended claims.

What I claim is:

I. A shear for non-metallic sheet material comprising an elongated relatively fixed body having laterally-spaced parallel shearing edges, a handle-equipped shearing knife pivoted to the forward end portion of said relatively fixed body for pivotal movements into and out of the space between said spaced shearing edges, said shearing knife being of a width to work snugly between the spaced shearing edges of said body, said fixed body forwardly of said pivotal connection of said knife being provided with an arm which projects upwardly and rearwardly and terminates in overhanging spaced relation to said knife rearwardly of the pivot, a lever pivotally connected at its upper end to the free end of said arm, a link pivotally secured at one end to the forward end portion of said handle rearwardly of the pivot but in overlying relation to said knife, said link at its opposite end being pivotally connected to the intermediate portion of said lever, a feeding member pivotally mounted to the lever for'swinging movements laterally of the knife but on an axis parallel to the axis of swinging movements of said lever, said member terminating at its lower end portion in material engaging teeth, stop means limiting rearward movements of said feeding member, and yielding means biasing said member in a rearward direction.

2. The structure defined in claim 1 in which the forward end of said relatively fixed body is slotted to provide said laterally-spaced parallel shearing edges, and in further combination with a pair of laterally-spaced material engaging rollers one on each side of said body forwardly of said knife, the peripheral edge portions of said rollers projecting above the plane of said body.

3. The structure defined in claim 1 in which the for ward end of said relatively fixed body is slotted to provide said laterally-spaced parallel shearing edges, and in further combination with a pair of laterally-spaced material engaging rollers one on each side of said body forwardly of said knife, the peripheral edge portions of said rollers projecting above the plane of said body, and a pair of laterally projecting supporting wings pivotally secured to said body for swinging movements between an inoperative position generally parallel to and adjacent said body to an operative material supporting position transversely of said body.

4. The structure defined in claim 1 in further combination with a lubricating means for said shearing knife, said lubricating means including a tubular reservoir, means mounting the reservoir to said lever and said link, said means including a pair of mounting arms, and a wickacting wiper element projecting outwardly from the bottom of said reservoir and in contact with the adjacent edge portion of said blade, said last-mentioned arms maintaining said wiper element in contact with the edge portion of the blade during the entire swinging movement of said blade.

References Cited in the file of this patent UNITED STATES PATENTS 2,548,320 Pearson Apr. 10, 1951 

